OCPP: allow waiting for meter values

charger/ocpp.go

@@ -171,7 +171,7 @@ func NewOCPP(id string, connector int, idtag string,
 		conn.TriggerMessageRequest(core.BootNotificationFeatureName)
 		select {
 		case <-time.After(timeout):
-			c.log.DEBUG.Printf("BootNotification timeout")
+			c.log.WARN.Printf("boot notification timeout")
 		case res := <-cp.BootNotificationRequest():
 			c.bootNotification = res
 		}
@@ -285,6 +285,13 @@ func NewOCPP(id string, connector int, idtag string,
 	if c.hasMeasurement(types.MeasurandPowerActiveImport) || c.hasMeasurement(types.MeasurandEnergyActiveImportRegister) {
 		conn.TriggerMessageRequest(core.MeterValuesFeatureName)
 
+		// wait for meter values
+		select {
+		case <-time.After(timeout):
+			c.log.WARN.Println("meter value timeout")
+		case <-c.conn.MeterSampled():
+		}
+
 		if meterInterval > 0 && meterInterval != meterSampleInterval {
 			if err := c.configure(ocpp.KeyMeterValueSampleInterval, strconv.Itoa(int(meterInterval.Seconds()))); err != nil {
 				return nil, err

charger/ocpp/connector.go

@@ -24,6 +24,7 @@ type Connector struct {
 
 	status  *core.StatusNotificationRequest
 	statusC chan struct{}
+	meterC  chan map[types.Measurand]types.SampledValue
 
 	meterUpdated time.Time
 	measurements map[types.Measurand]types.SampledValue
@@ -42,6 +43,7 @@ func NewConnector(log *util.Logger, id int, cp *CP, timeout time.Duration) (*Con
 		clock:        clock.New(),
 		statusC:      make(chan struct{}),
 		measurements: make(map[types.Measurand]types.SampledValue),
+		meterC:       make(chan map[types.Measurand]types.SampledValue),
 		timeout:      timeout,
 	}
 
@@ -54,6 +56,10 @@ func (conn *Connector) TestClock(clock clock.Clock) {
 	conn.clock = clock
 }
 
+func (conn *Connector) MeterSampled() <-chan map[types.Measurand]types.SampledValue {
+	return conn.meterC
+}
+
 func (conn *Connector) ChargePoint() *CP {
 	return conn.cp
 }

charger/ocpp/connector_core.go

@@ -71,6 +71,11 @@ func (conn *Connector) MeterValues(request *core.MeterValuesRequest) (*core.Mete
 		}
 	}
 
+	select {
+	case conn.meterC <- conn.measurements:
+	default:
+	}
+
 	return new(core.MeterValuesConfirmation), nil
 }